Relative humidity effect on the formation of highly oxidized molecules and new particles during monoterpene oxidation

Li, Xiaoxiao; Chee, Sabrina; Hao, Jiming; Abbatt, Jonathan P. D.; Jiang, Jingkun; Smith, James N.

doi:10.5194/acp-19-1555-2019

Title: Relative humidity effect on the formation of highly oxidized molecules and new particles during monoterpene oxidation

Journal Article · 05 February 2019 · Atmospheric Chemistry and Physics (Online)

DOI: https://doi.org/10.5194/acp-19-1555-2019 · OSTI ID:1493639

Li, Xiaoxiao; Chee, Sabrina; Hao, Jiming;

; Jiang, Jingkun;

It has been widely observed around the world that the frequency and intensity of new particle formation (NPF) events are reduced during periods of high relative humidity (RH). The current study focuses on how RH affects the formation of highly oxidized molecules (HOMs), which are key components of NPF and initial growth caused by oxidized organics. The ozonolysis of α-pinene, limonene, and Δ³-carene, with and without OH scavengers, were carried out under low NO_x conditions under a range of RH (from ~3% to ~92%) in a temperature-controlled flow tube to generate secondary organic aerosol (SOA). A Scanning Mobility Particle Sizer (SMPS) was used to measure the size distribution of generated particles, and a novel transverse ionization chemical ionization inlet with a high-resolution time-of-fight mass spectrometer detected HOMs. A major finding from this work is that neither the detected HOMs nor their abundance changed significantly with RH, which indicates that the detected HOMs must be formed from water-independent pathways. In fact, the distinguished OH- and O₃-derived peroxy radicals (RO₂), HOM monomers, and HOM dimers could mostly be explained by the autoxidation of RO₂ followed by bimolecular reactions with other RO₂ or hydroperoxy radicals (HO₂), rather than from a water-influenced pathway like through the formation of a stabilized Criegee intermediate (sCI). However, as RH increased from ~3% to ~92%, the total SOA number concentrations decreased by a factor of 2–3 while SOA mass concentrations remained relatively constant. These observations show that, while high RH appears to inhibit NPF as evident by the decreasing number concentration, this reduction is not caused by a decrease in RO₂-derived HOM formation. Possible explanations for these phenomena were discussed.

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Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)

Grant/Contract Number:: SC0014469

OSTI ID:: 1493639

Journal Information:: Atmospheric Chemistry and Physics (Online), Journal Name: Atmospheric Chemistry and Physics (Online) Journal Issue: 3 Vol. 19; ISSN 1680-7324

Publisher:: Copernicus Publications, EGUCopyright Statement

Country of Publication:: Germany

Language:: English

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